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Lexmark 249X, 248X manual 102, XON/XOFF Protocol Timing

Models: 249X 248X

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The following diagram illustrates DTR Protocol Timing.

Legend:

1The RTS signal is driven directly by the RS-232C line driver and is active any time power is supplied to the printer.

2The DTR signal becomes active (high) when initialization is complete, telling the computer that the printer is ready to receive data.

3DTR drops (low) to tell the computer that the printer buffer is full or the printer is busy and data transmission should stop. If the computer con- tinues to send data after the printer lowers the DTR signal, data could be lost. DTR is raised (high) when the printer is again ready to receive data.

XON/XOFF Protocol Timing

When you select this flow control protocol, the printer sends an XOFF command to the host to indicate that the printer cannot receive more data because it has one of the following conditions:

•Buffer full

•Attendance error (paper out, printer error)

•Printer is not in ready state

The following diagram illustrates XON/XOFF Protocol Timing.

Legend:

1Data received when DSR is low is invalid and discarded.

102	Section 6: Using the Printer Interface

Image 102

Lexmark 249X, 248X manual 102, XON/XOFF Protocol Timing

Contents

Forms Printer 248x/249x United States Government Restricted Rights Contents Page Epson Mode Printer Commands Barcodes Glossary Index Viii Introduction Available Options Physical CharacteristicsWidth Height Depth Weight Options Part Number 2480 2481 2490 2491Printhead Description Mode 2480/2481 2490/2491Print Speeds 248xPower Requirements Environmental ConditionsNoise Emission Value Alternating Current Line Voltage PowerPower Cord Following are noise emission values for your printerPaper Specifications 2480/2490 Narrow Carriage ModelsLength 2481/2491 Wide Carriage Models Tractor Feeder continuous forms Manual Feed cut sheetsPower-On Diagnostics Ribbon SpecificationsDiagnostics Printer TestProgramming Examples Wend Introduction SIC Command Format Use the following formatInitial Values Description Printer Dec Hex Parm Description Selection Dec HexBit Off Parm Description Selection Dec Hex Parm Description Selection Dec Hex Parm Description Selection Dec Hex Code Symbol Description Value Name Dec Hex Control CodesPrinter Command Parameters Escape SequencesCommand Structure Example of IBM Emulation Mode Printer Command Select Code Page name of commandFor more Printer Command Quick Reference IBM Emulation ModeFunction Command Dec Hex See Information58 n1,n2 1B 5B 67 Ln Hn modeMode data Data M3 m4Select Character Set Selecting a Character SetSelect Code Usage NotesPrint From Code Continuously Print Characters from a CodeUsage Note Download a Character SetPrint One Character Located in the code page tables beginning onSelect Global Font Start low/start highSelect Global Font GothicPrestige Presentor OratorScript Pitch Dec Hs, Ls Hex Hs, Ls Global Font and Size ParametersGlobal Font and Code Code Decimal HexSelect Print Mode This command sets the pitch at 12 cpiSelect 12 cpi Dec Hex Print Mode 248x249x Select Print Type Style Dec Hex Height Line Space Dec HexDouble-Strike Print Use this command for bold print To begin bold printEmphasized Bold Print To end bold printSuperscript or Subscript Set Print DirectionContinuous Double-wide Printing Cancels double-wide printing modeSets double-wide printing mode Score SelectContinuous Underline Continuous OverscoreSet Print Quality Decimal HexBit Number Binary Value Print Wires Graphics Print ModesNormal Density Bit Image Graphics Mode and Horizontal Density 249x Only Mode DecHorizontal Density Wires Mode Dec Hex Horizontal Density Wires Dual-Density Bit Image Graphics Half SpeedDual-Density Bit Image Graphics Normal Speed High-Density Bit Image GraphicsSet Default Tabulation Stops Horizontal MovementSet Horizontal Tabulation Stops This command sets the left and right margins Set Horizontal MarginsMove Current Print Position Reverse Line Feed Line ControlAutomatic Line Feed LF Move Paper VerticallySet Vertical Tabulation Stops Vertical TabulationSet Vertical Units Sets as many as 64 tabulation stops by line numberSet Line Spacing to 7/72 Inch Line SpacingSet Line Spacing to 1/8 Inch Activate Line Spacing for TextSet Line Spacing for Text Porportional Space ModeThis command turns porportional space mode on and off Set Line Spacing for GraphicsSet Page Length in Inches Set Top of Form and Page LengthSet Top of Form Set Page Length in LinesCancel Skip Perforation This command cancels Set Skip Perforation ESC NSet Skip Perforation Printer Control Setup Barcode ParameterThis command sets the barcode parameters to the printer Deselect PrinterUnit Module Width Dots Dec Hex Wire Barcode TypeSetup Barcode Data Dec Font Selection Name Dec Hex DescriptionSelect an International Character Set249x Select Letter-Quality Font 248x Select Near-LetterQuality Font Select Character StyleFunction Assign Character TablesParameter range Table/CodeText Print Mode Delete Text Select JustificationBegin or End Double-high Printing Off Dec Hex Print StyleNormal Density Bit Image Graphics Pin Graphics Mode 248x onlyChange Graphics Mode Command Dual Density Bit Image GraphicsSet Graphics Mode Dots per Inch Density Dpi Equivalent CommandSet Horizontal Tab Stops BackspaceHorizontal Tab Set Absolute Print PositionVertical Movement Format Other Commands Select Condensed Mode Setup Barcode ParameterSetup Barcode Data Define Download CharacersEpson Emulation Mode Printer Commands Select Block Graphics Character Character SetSelect Standard Character Set SetDecimal Print from CodeCode Page Set HexadecimalCharacter Size and Spacing Value Variable/Feature Character StyleFactor 112 Custom Characters Stored graphics data in one dot column buffer Dots per inch/DensitySpeed/Word Size Set Horizontal Tabs by Characters Backspace Carriage ReturnExecute Horizontal Tab Pitch 2480 2481Set Horizontal Tabs by Dot Columns Pitch Shift IncrementIndent from Left Margin Move to the Right Set Multiple Print PositionsMove to the Left Begin Uni-directional PrintingSet Page Length in Lines Cancel Skip Over PerforationSet Page Length in Inches Select Skip Over PerforationSelect Print Suppress Mode Cancels Half-speed PrintingCancel Paper-out Sensor Cancel Print Suppress ModeEject Parallel Interface Parallel Interface Voltage LevelsComputer to Printer Communication Pin Connections Computer1329605 10 ft 1427498 20 ft Printer Parallel Pin Assignments Pin Line DescriptionTiming InitSerial Interface How to Connect the RS-232C Serial InterfaceUniversal Serial Bus Interface Serial Interface OptionPin Signal Description Serial Cable Pin Assignments RS-232CFollowing illustration shows the RS-232C serial cable Serial Interface Cable RS-232C Using an IBM AT Personal Computer RS-232C Serial Communication Parameters RS-232CVoltage Level Range Data Transmission 100Serial Data Frame Considerations RS-232C Start and Stop BitsErrors 101Data Flow Control 102 XON/XOFF Protocol TimingOS/2 1.2 Serial Computer Configuration Recommendations RS-232C103 OS/2 2.0104 Designing Draft and NLQ Characters How Dots Are Added in NLQ Mode248x Printers 105106 Vertical Lines107 Intersections of Vertical and Horizontal Lines108 Diagonal Intersecting Horizontal LineDesigning Fast Draft Characters Designing NLQ II Characters Downloading Characters109 Downloading a Draft/NLQ Character Set 110Initializing the Download Area Part One Calculating Count 1, Count111 Part Two Specifying the Download DataBit Bit Values Functions 112 PrintableDesigning and Downloading the Draft/NLQ Copyright Symbol 113114 115 Downloading an NLQ II Character Set116 117 Bit FunctionsPrintable Data 118 119 120 249x PrintersDesigning and Downloading Characters Downloading a New Font121 Font Descriptor ByteDesign Considerations 122 Download Sequence123 Managing the Download Area 124Lookup Table Designing Monospaced Fast Draft Characters 125126 MSB LSBUse the following command to initialize the download area 127Creating the Character Data Downloading the Font Descriptor Byte 128Downloading the Character Data For more information about the Font Descriptor Byte, seeDownloading the Lookup Table Data 129Creating the Lookup Table Data Send the following lookup table information to the printerDesigning Monospaced Draft Characters 130Printing the Character 131 LSB MSB132 Initializing the Download Data133 134 Designing Proportionally Spaced Characters 135136 LSB MSB137 Compressing the Character138 139 Send the following lookup table example to the printer140 Designing Enhanced Letter Quality Characters 141142 143 1FFFF0144 145 146 Barcodes Barcode FunctionBarcode Setup Command Barcode Type Value 149Is a space module Is a bar module 248x 249xIs the space width adjustment factor Value 248x space 249x space Module adjustment151 Minimum Minimum v1 Printer Model Value ValuesData Transfer Command Barcode Symbologies 153N2 value Data character set 13, x0D12, x0C Character HexValid EAN-13 command 155Invalid EAN-13 command N2 valueValid EAN-8 command 157Barcodes 159 To 255, x01 to xFFX53 Valid Code 39 command 161Invalid Code 39 command Lowercase ’a’ is not a valid data character for Code163 Interleaved 2of5Valid Interleaved 2of5 command Invalid Interleaved 2of5 command 16511, x0B Valid UPC-A command 167 N1 value b0=1 CharacterValid Postnet command 169Postnet ’-’ dash is an invalid character for Postnet171 To 255, x02 to xFFData character sets Function Hex173 Data character set aHex Character Code Data character set B 175 Data character set CValid Code 128 command Invalid Code 128 command 177Valid Code 128 command using multiple character sets 179 X0005 181 Example 183 Space width adjustment = default 185 Barcodes Code Pages Code Code Page 437G 189Code 191 Code Code Page 853T 193Code 195 Code 197 Code 199 Code 201 Code 203 Code Command Printing a Code205 Output from the previous example is shown belowSet Font Global, ESC 207 248x Font Global IDs FGIDs Decimal, Hex and Byte DecimalGothic 209 249x Font Global IDs FGIDs Decimal, Hex and Byte DecimalPitch 211 Decimal Hex Code 213 Print Quality Decimal HexInteraction of Set Font Global and Set Print Quality Select Fast DraftCharacter Sets 1 215Character Set 217 Code Pages Glossary Glossary Numerics Data flow control RS-232C Data frames serial Data packetsSee serial adapter Index Index Reader’s Comment Form Business Reply Mail